At present, the per unit area yield of grain varies widely in the same districts, the highest yield being 7,500 kg to 15,000 kg per hectare, and the lowest 3,000 kg to 5,000 kg.

• 目前，中国同一类型地区粮食单产水平悬殊，高的每公顷7500-15000公斤，低的只有3000-5000公斤。